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M. F. WILLIAMS.

CAGE.

APPUCAHON HLEI) SEPT.20, I919- 1,322,210. Patented Nov. 18, 1919.

D v Fay 3 O I 6 F H UNITED STATES PATENT OFFICE.

MILTON F. WILLIAMS, OF ST. LOUIS, MISSOURI, ASSIGNOR TO WILLIAMS PATENTCRUSHER 8c PULVERIZER (30., OF ST. LOUIS, MISSOURI, A CORPORATION OFMISSOURI.

CAGE.

Specification of Letters Patent.

Patented Nov. 18, 1919.

To all whom. it may concern:

Be it known that I, Munox l \Vnmrurs,

a citizen of the I'nitcd States, residing at St.

Louis, State of Missouri, have invented certain new and usefulImprovements in Cages, of which the following is a specification.

This invention relates to certain new and useful improvements of cagesfor crushers and pulverizers, the peculiarities of which will behereinafter described and claimed.

The object of my invention is to provide means to fasten securely theends of an ar' cuate screen so that the ends cannot get loose, bendover, or come in contact with the hammers traveling closely adjacentthereto.

In the accompanying drawing in-which like reference letters indicatecorresponding parts, Figure 1 represents a side View of an arcuate cagepartly in section; Fig. 2 a reversed plan view of said cage with partbroken away; and Fig. 3 an enlarged perspective view of part of the cageshowing the construction.

In grinders and pulverizers, the grinding cage is frequently ofperforated metal forming a screen which is supported by an arcuate framein a suitable casing in which is mounted rotary pivoted hammers, thepoints of which travel in close proximity to the screen. When the metalof which the screen is composed, especially when it is perforated metal,becomes heated from use, it is expanded and beaten against the crossbars, or is formed into ridges and presents an uneven sur'face as wellas tending to become loosened at the ends where it is connected to thecage frame. I propose in my present construction to obviate suchdifficulties and in the accompanying drawing present one form as thepreferred fastening means for the ends.

The letter A designates a rotary pointed hammer, a series of which aremounted in any suitable manner upon a rotary shaft B, so as to travelinclose proximity to a screen C of perforated metal, or otherwise, whichis carried in a frame composed of arcuate side pieces D concentric withthe shaft B, and provided with a slot F in which the screen C ismounted. The sides are con nectcd by cross bars Eat the respective ends,which bars are notched at G for receiving the ends of intermediatesupporting arcuate bars H, likewise concentric with the shaft B and thinor beveled on their upper edges h Fig. 3, to avoid stopping up the holesin the screen (1, directly above it. According to the width of thescreen, one or more of the said bars I: is employed, and they are spacedon the. cross rods I that pass through them and are riveted into thesides I). At each side of the supporting arcuate bar H, is a cross pin Jpassing through the cross rod and close to each side of the bar H toassist in keeping it vertical. The slot G in the end bar E holds theends of said bars H in proper vertical position. The rods 1 are spacedaway from the screen C, to prevent contact of the screen with the rodsand allow the discharge of material through the openings in the cage.

The ends of the screen are fastened to the cross piece E by means of anoverlapping angle-bar K fastened by rivets in both directions to the endpiece E. As the hammers travel close to the screen they would interferewith this angle bar if it were not that the'slot F in the side pieces Dis tapered or enlarged as shown at F in Fig. 3 for a short distance, inorder to allow the ends of the screen to straighten out or be deflectedfrom the balance of the screen, so as to allow the overlapping piece Kto rest in the groove F at its ends as shown in Fig. 3, and yet projectno farther inward radially than the major portion of the screen C; inthis way no interference with the hammers is possible and both ends ofthe screen are securely fastened to the frame in a similar manner,allowing of reversing the cage as may be required when a portion of thescreen near one end is worn unevenly.

The bar K overlapping the screen, is preferably double flanged as shownin the angle bar, so that the thrust of the screen under action of thematerial being ground, will be resisted by the flange directly fastenedto the end cross bar E. The fastening rivets or other means secure thepreferred form of overlapping bar in both directions to the cross bar E,and the inner flange of the angle bar secures the end of the screen tothe inner face of the cross bar E, yet by the straightening outward ofthe ends of the screen and the widened slot at F this inner flange doesnot project into the path of the hammers any more than the arcuateportion of the screen between its endsi I claim:

1. A device of the character described,

comprising an arcuate screen, arcnate side bars having arcuate slotstherein, and cross bars forming a frame for said screen,said slots beingwidened outward at the ends, a bar overlapping the ends of said screen,and fastening means for the latter bar, securing it and the interposedscreen to said cross bar.

2. A device of the character described comprising an arcuate screen,arcnate side bars having arcuate slots therein, and notched cross barsforming a frame for said screen, arcuate supporting bars relatively thincompared with the radial depth and located below the screen and engagingsaid notched cross bars, and supporting the screen intermediately of theside bars, and cross rods signature.

MILTON F. WILLIAMS.

